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mm: bdi: allow setting a maximum for the bdi dirty limit

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Add "max_ratio" to /sys/class/bdi.  This indicates the maximum percentage of
the global dirty threshold allocated to this bdi.

[mszeredi@suse.cz]

 - fix parsing in max_ratio_store().
 - export bdi_set_max_ratio() to modules
 - limit bdi_dirty with bdi->max_ratio
 - document new sysfs attribute

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Zijlstra
2008-04-30 00:54:36 -07:00
committed by Linus Torvalds
parent 189d3c4a94
commit a42dde0415
6 changed files with 111 additions and 13 deletions
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9
Documentation/ABI/testing/sysfs-class-bdi
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@@ -49,4 +49,11 @@ min_ratio (read-write)
Minimal percentage of global dirty threshold allocated to this
bdi. If the value written to this file would make the the sum
of all min_ratio values exceed 100, then EINVAL is returned.
The default is zero
If min_ratio would become larger than the current max_ratio,
then also EINVAL is returned. The default is zero
max_ratio (read-write)
Maximal percentage of global dirty threshold allocated to this
bdi. If max_ratio would become smaller than the current
min_ratio, then EINVAL is returned. The default is 100